Improvement in locks



tnittd crire @tutti dhiita- MOSES O. BAKER, 0E NEW YORK, N. Y.

Letters Patent No. 103,542, dated May 31, 1870.

IMPROVEMENT IN LOCKS'.

The Schedule referred to in these Letters Patent and making part of the same To all whom. 'it may concern .l

Nature and Objects of the Invent/ion.

The said improvements relate to the class of locks known as flat-key cylinder locks, and the object of the invention. is to simplify the construction so as to enable them to he cheaply made, and, at the same time, furnish additional safety Afrom Vpicking, and afford greater facility for effecting changes by which different keys will be reqnired'for ditierent locks of the same general character of construction.

To effect these various purposes the invention consists of a sliding collar, working within th'e cylinder from which this class of locks takes its name, and which collar may be .called a .knife, as it performs the same functions as the knife of an ordinary cylinder lock.

In addition to these functions, however, it is made to slide within the cylinder, the motion being irnparted by the key without turning, until it has reached a certain point, where it fitsa notch in the inner tube and permits the tube to be turned bythe key to with Jdraw the latch. As the key operates upon slides 0r tumblers at the saine time that it operates upon the knife or collar, the necessity arises, before the latch can be moved, for bringing both the sliding collar and the slides at the iight point together.

If one or more of the slides be .moved too-far or too little, or if the collar be moved too far or too little, the latch cannot be drawn, aud,'fur thermore, if the slide, or all the slides, if there should-be more than one, and the collar do not reach and remain at the right poin't when the key is turned, the latch will not be moved.

.lo enable others skilled in the art to which it appertains to make and use my invention, I will proceed to'describe its construction and operation, with reference to the drawing.

Description of the Drawing.

A' with a fiat key;

Figure 2 is a side elevation of the parts within the cylinder.

Figure 3 is a slide; and l Figure 4 is the collar, in section.

The sliding collar a works to and fro in the'cylinder b, and is kept from turning by a projecting tongue that fits in'to a corresponding groove in the cylinder.

The collar is'moved in by the corners c of the key, and it is pressed out when the key is removed by the spring d.

The end ofthe collar has a flange, c, turned inward,

that titsthe flattened side ofthe tube, and permits the tube to turn only when the flange e is brought op-v posite the notch f.

In a similar way the slide is moved by the end of the key, and'by a spring, g, and has a notch, h, that must also be brought opposite the notch f before the tube can be turned. v

The tube may havel several slides, and the notches of all of them, and of. the collar, and of the tube, must all be simultaneously brought together,before the key can turn the tube and operate the latch by means of a shoe or follower, or any other device employed for that purpose.

With regard to a simple alteration,` which will require a dili'erence in the keys, the part that operates the collar may be lengthened or shortened a number of times within the range permitted-by the length of the cylinder, and each new proportion will permit a like number of changes inthe part that operates the slides.

' A great number of locks may be made of the same general pattern, and changes eifected in them all, so as to require as great aI number of keys, by simply altering the relative lengths of the slides and collars.

I claim as my invention- 'The sliding collar or knife, operated by the key and working within the cylinder', in,coinbiuation with the slides or tumblers, substantially as described.

M. O. BAKER.

Witnesses DANI.. J. DAY, WM. KEMBLE HALL. 

